diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-09-24 04:03:49 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-10-06 00:30:08 +0300 |
| commit | 6954e415264eeb5ee6be0d22d789ad12c995ee64 (patch) | |
| tree | 12da7d7dafca9da48f6b42d917a24ff84244f0f1 /kernel/trace/trace.h | |
| parent | bf094cffea2a6503ce84062f9f0243bef77c58f9 (diff) | |
| download | linux-6954e415264eeb5ee6be0d22d789ad12c995ee64.tar.xz | |
tracing: Place trace_pid_list logic into abstract functions
Instead of having the logic that does trace_pid_list open coded, wrap it in
abstract functions. This will allow a rewrite of the logic that implements
the trace_pid_list without affecting the users.
Note, this causes a change in behavior. Every time a pid is written into
the set_*_pid file, it creates a new list and uses RCU to update it. If
pid_max is lowered, but there was a pid currently in the list that was
higher than pid_max, those pids will now be removed on updating the list.
The old behavior kept that from happening.
The rewrite of the pid_list logic will no longer depend on pid_max,
and will return the old behavior.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index b7c0f8e160fb..2ec500186992 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -22,6 +22,8 @@ #include <linux/ctype.h> #include <linux/once_lite.h> +#include "pid_list.h" + #ifdef CONFIG_FTRACE_SYSCALLS #include <asm/unistd.h> /* For NR_SYSCALLS */ #include <asm/syscall.h> /* some archs define it here */ @@ -188,10 +190,14 @@ struct trace_options { struct trace_option_dentry *topts; }; -struct trace_pid_list { - int pid_max; - unsigned long *pids; -}; +struct trace_pid_list *trace_pid_list_alloc(void); +void trace_pid_list_free(struct trace_pid_list *pid_list); +bool trace_pid_list_is_set(struct trace_pid_list *pid_list, unsigned int pid); +int trace_pid_list_set(struct trace_pid_list *pid_list, unsigned int pid); +int trace_pid_list_clear(struct trace_pid_list *pid_list, unsigned int pid); +int trace_pid_list_first(struct trace_pid_list *pid_list, unsigned int *pid); +int trace_pid_list_next(struct trace_pid_list *pid_list, unsigned int pid, + unsigned int *next); enum { TRACE_PIDS = BIT(0), |